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PowerBook Tech has a knowledge base of fully-illustrated documentation for completely disassembling your Wallstreet, Lombard, Pismo, Titanium, or All-White iBook.
Now there is another site for Powerbooks: PBFixIt.com
And jupiter10 notes that Powerbook Medic has take apart manuals too.
Note: Only attempt to use these instructions if you are very comfortable with the risk of voiding your warranty or causing permanent damage to your system!